P050B

DTC P050B COLD START IGNITION TIMING PERFORMANCE

1. OUTLINE OF DIAGNOSIS
Detect malfunctions of the catalyst advanced idling retard angle control.
Judge as NG when ECM is not controlling the angle properly during catalyst advanced idling retard angle control.
Judge as NG if there is exhaust gas temperature diagnosis, idle speed diagnosis and final ignition timing diagnosis, and if any one of them is judged as NG.
- Exhaust gas temperature diagnosis (P050A)
Judge as NG when the estimated exhausted gas temperature in 14 seconds after the cold start is below the specified value.
- Idle speed diagnosis (P050A)
Judge as NG when actual engine speed is not close to target engine speed at cold start.
- Final ignition timing diagnosis (P050B)
Judge as NG when actual retard amount is under the specified value at cold start.

2. ENABLE CONDITIONS









3. GENERAL DRIVING CYCLE
Perform the diagnosis at cold start.

4. DIAGNOSTIC METHOD

- Exhaust gas temperature diagnosis

- Abnormality Judgment
Calculate the estimated exhaust gas temperature when the diagnostic enable condition is established. Judge as NG when the following conditions are established.






Time Needed for Diagnosis: 14 seconds

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

- Normality Judgment
Judge as OK and clear the NG if the following conditions are established.






Time Needed for Diagnosis: Less than 1 second

- Idle speed diagnosis

- Abnormality Judgment
Judge as NG when the following conditions are established.






Time Needed for Diagnosis: 5000 ms

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

- Normality Judgment
Judge as OK and clear the NG if the following conditions are established.






Time Needed for Diagnosis: 5000 ms

- Final ignition timing diagnosis

- Abnormality Judgment
Judge as NG when the following conditions are established.






Time Needed for Diagnosis: 5000 ms

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

- Normality Judgment
Judge as OK and clear the NG if the following conditions are established.






Time Needed for Diagnosis: 5000 ms